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Audacity rocks, is all I can say. Just added the spin-up and spin-down
effects to "Vampire Megabyte". Cool.

After experimenting unsuccessfully with various samples of a tablesaw
spinning up and down, I decided to work directly in Audacity. Spin-up
started with a 3-second sawtooth chirp going from 110Hz to 880Hz. I then
applied a couple of distortion-type effects (with very little success),
followed by gverb. That worked, very nicely.

After that it was just a combination of pitch and tempo changes to stretch
it out to the right length. The spin-down was, of course, a shorter chirp
in the opposite direction.